Sacks isn't very pleased with Yahoo's current attempt at suing Facebook. He told Business Insider earlier that he thinks Yahoo is eyeing patents as a new revenue center, which sets a dangerous precedent.

Before this, he tweeted "Yammer will never hire another former Yahoo employee who doesn't leave in the next 60 days." Now it looks like he's trying to speed things up.

(He later told us that he didn't want to "beat up on the rank and file" at Yahoo, so the promise applies to Yahoo managers, lawyers, and board members.)